Which of the following is a scalar quantity?

Think it through first, then pick an option.

Answer and explanation

Correct answer: a Pressure

Pressure is a scalar: it has a magnitude only and needs no direction. The book does not name it in this section, but the board asks it.

Why the other options are wrong

b Force: Force is a vector, the book's own example: to express a force you must give its direction along with its magnitude.
c Displacement: Displacement is a vector, because it has both magnitude and direction. Only distance is a scalar.
d Weight: Weight is a force that acts downward, so it is a vector. Mass is a scalar, but weight is not.